Now I feel silly posting after all these long educated replies

.
I feel that the extended stuff like rape, extreme violence or child abuse in a game is only ok, for whatever reason, if:
You do not see or hear it - a blackout before he grabs her, or the camera stops following the player and there are no sounds that can vividly help the asshole playing the game enjoy the fantasy.
It is of moderate horribility, like stuff you could watch on daytime TV, or find in the general section of the library. Like you cannot compare racism and adult abuse to anything concerning a child. I saw a show on prisons where a man was beaten by everybody else for hurting a kid, it's a touchy subject I think.
You can label a game as Adults Only, you can restrict access and even lock it up but once an idea leaves the human mind into reality, somewhere/somehow/someway someone who isn't meant to see it will and shit will hit the fan.